EUCALYPTUS PLANCHONIANA. 



under my directions), simply because their wood is very extensively available in Victoria, and largely 

 went to waste ; whereas a document, presented not very long ago to Parliament in a neighboring 

 colony and reproduced in the Transactions of the Botanical Society of Edinburgh, vol. xiii. pag. 

 Ixv.-lxvi., and in some other journals, would lead to the impression, that only the three above-named 

 Eucalypts furnish wood-vinegar (and therefore acetic acid) and tar (and therefore also pitch and 

 empyreumatic oils). In the same manner all Eucalypts are pervaded to a greater or lesser extent 

 by Cajuput-like oil, but E. vimhialis is particularly among the poorest in yield of this oil, as 

 proved in the Victorian experiments made by Mr. Osborne, Mr. Bosisto and Mr. W. Johnson 

 on the writer's suggestions for former exhibitions. Again I caused paper to be prepared in 

 my laboratory from the bark of the above noticed species of Eucalyptus, not because that they 

 alone furnish the raw material, but because they were simply for us most handy at the time for at 

 random demonstrating by a few examples of what indeed holds good for a great genus of trees 

 with numerous species. Extra-samples of these preparations were freely distributed to museums 

 of vegetable products also in the adjoining colonies. 



The Kino of E. Planchoniana is one of very great astringency and therefore particularly 

 valuable for therapeutic purposes ; after adherent impurities are removed by alcohol, it is found 

 to be composed mainly of Kiuo-tanuic acid, the percentage being 93'88 of that acid, the rest 

 (0'12) consisting simply of real gum and seems quite free of gallic acid. Kiuo-tannic acid differs 

 from the allied Eucalypto-tauuic acid (occurring in the leaves of Eucalypts) by producing a dark- 

 blue (instead of a green) precipitate with chlorid of iron. 



The aged wood of E. Plauchouiaua contains, as far as a solitary experiment has shown, 

 0,900 vascular tubes and 270 medullary rays within a square inch ; the largest diameter of the 

 prosenchyma cells proved 00094, the thickness of their cell-walls 00050 inch. 



EXPLANATION OF ANALYTIC DETAILS. 1, upper portion of an unexpanded flower, the lid separated ; 2, longi- 

 tudinal section of an unexpauded flower ; 3, stamens in situ ; 4 and 5, front- and back-view of an anther with 

 portion of the filament ; 6, style and stigma ; 7 and 8, transverse and longitudinal section of fruit ; 9 and 10, 

 sterile and fertile seeds ; all more or less magnified, but in various degrees. 



